package service;

import mapper.UserMapper;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import pojo.User;
import utils.SqlSessionFactoryUtils;

public class UserService {
    //使用工具类获取SqlSessionFactory
    SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();
    /*** 登录方法 */
    public User login(String username, String password){
        SqlSession sqlSession = factory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        User user = userMapper.selectByUsername(username);
        if(user != null){
            //继续对比密码
            if(password.equals(user.getPassword())){
                //登录成功
                return user;
            }else{
                //密码不符
                return null;
            }
        }
        //因为用户不存在导致登录失败
        return null;
    }

    //注册用户
    public boolean register(String username, String password) {
        SqlSession sqlSession = factory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        //1.先检查此用户名是否可以被注册
        User user = userMapper.selectByUsername(username);
        if (user!=null){
            //如果此条件成立，代表数据库中已有该名称用户
            return false;
        }
        //2.如果能被注册，则执行操作
        User newUser = new User(null, username, password);
        int i = userMapper.add(newUser);//添加成功的用户数量
        sqlSession.close();
        sqlSession.commit();
        return i>0;
    }
    /*
    检查用户名是否存在
     */
    public boolean checkUsername(String username) {
        SqlSession sqlSession = factory.openSession();
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        //1.先检查此用户名是否可以被注册
        User user = userMapper.selectByUsername(username);
        if (user!=null){
            //如果此条件成立，代表数据库中已有该名称用户
            return true;
        }
        sqlSession.close();
        return false;
    }
}
